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Tested were 1788 purebred Arabian fillies and colts raced during the following periods: I (seasons 1927-1939), II (seasons 1946-1961) and III (seasons 1962-1992). There were divided into groups according to quantities of horses submitted to performance trials (more than 20 heads, 5-20 and less than 5 ones). It was found, that in greater herds more often occurred extreme values of coefficients of success...
Successes in breeding of all animal species are mostly determined by high reproductive indices. That´s why tested were 127 purebred Arabian stallions used in Polish breeding in the years 1971-1998, siring 5 or more heads of progeny. For every stallion collected were data concerning number of mares bred, born foals, open periods, abortions, stillborn, dead or destroyed foals, as well as mares, who...
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